(under the class definition) Processes and apparatus involving a condensing device which in use operates substantially below 0 deg. C and substantially below atmospheric pressure to condense a material which exists as a gas in the feed line to the condensing device by condensing and retaining the material as a liquid or solid on a heat exchange surface which is kept sufficiently cold by means which is usually a liquefied or solidified gas or mixture thereof to cause the desired condensation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
8+, for processes and apparatus for manufacturing a liquefied or solidified gas mercantile product from a normally gaseous material.
272, for refrigeration with means for preventing or handling atmospheric condensate.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
73+, 284+, 402, and 468, for processes and apparatus for drying which if operated at sufficiently low pressure may use a "cold trap". 96, Gas Separation: Apparatus, for gas separation apparatus provided with heating or cooling means.
137, Fluid Handling,
171+, for fluid separating traps or vents in a fluid distribution system of more general application.
165, Heat Exchange,
110+, for a heat exchanger of more general application in which a body or stream of fluid of one density is in communication with a fluid of a second density, one of which is condensed.
